CN101854076B - Voltage change-over switch control circuit - Google Patents
Voltage change-over switch control circuit Download PDFInfo
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- CN101854076B CN101854076B CN2010101696854A CN201010169685A CN101854076B CN 101854076 B CN101854076 B CN 101854076B CN 2010101696854 A CN2010101696854 A CN 2010101696854A CN 201010169685 A CN201010169685 A CN 201010169685A CN 101854076 B CN101854076 B CN 101854076B
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Abstract
The invention provides a voltage change-over switch control circuit, comprising a square wave generator, wherein the square wave generator is provided with two voltage input ends which respectively input a first voltage and a second voltage; the square wave generator comprises a first output end and a second output end which respectively reversely output square waves; the first output end is connected with a first control circuit consisting of a first capacitor, a third diode, a first triode, a first triode and a first diode; the second output end is connected with a second control circuit consisting of a second triode and a second diode; and a second capacitor and a load resistor are arranged between the first control circuit and the second control circuit. The invention provides the voltage change-over switch control circuit. Two 12V batteries for 24V are alternatively used for supplying power for a 12V load by using a low-frequency switch mode.
Description
Technical field
The present invention relates to the voltage transitions field, and be particularly related to a kind of voltage change-over switch control circuit.
Background technology
The application of middle high capacity cell is main with monomer output direct current 12V.Especially automobile-used startup battery.The lead-acid sealed battery of monomer 12V normally.Usually use 12V as starting and the electric power supply battery for the small gasoline car.And, use 2 12V cell series connection usually for large car or diesel vehicle.Obtaining the 24V direct current supplies startup and electrical equipment to use.But on the car of 24V power supply, electrical equipment that usually can instructions for use 12V power supply.So just need 1 24V to change the supply convertor of 12V.This supply convertor needs the high frequency switch power conversion, and conversion process has the certain power loss, and can produce bigger electromagnetic interference.Circuit is also comparatively complicated.
Can draw the use of 12V confession 12V electrical equipment by the monomer 12V battery from 24V so? Answer is negated.If because like this, the 12V cell of 2 series connection can capacity unbalance.When charging, cause one of them battery overcharge and damage battery.
Summary of the invention
The present invention proposes a kind of voltage change-over switch control circuit, uses the low frequency on-off mode to use 2 12V batteries of 24V in turn, gives the 12V electric.
In order to achieve the above object, the present invention proposes a kind of voltage change-over switch control circuit, comprising:
Square-wave generator, it has two voltage input ends, imports first voltage and second voltage respectively, and said square-wave generator comprises first output and second output, respectively anti-phase output square wave;
Wherein first output is connected with the first control circuit of being made up of first capacitor, the 3rd diode, first triode and first diode; Said second output is connected with the second control circuit of being made up of second triode and second diode, is parallel with second capacitor and load resistance between said first control circuit and the second control circuit.
Further, said first voltage is 12V, and said second voltage is 24V.
Further, said square-wave generator is the square-wave generator of 50% duty ratio, said first output and second output, and the square wave of 50% duty ratio is exported in anti-phase respectively.
Further, said first diode and second diode are Schottky diode.
Further, one of them rising edge should be slower than another trailing edge on sequential in the output of said first output and second output.
The present invention proposes a kind of voltage change-over switch control circuit, uses the low frequency on-off mode to use 2 12V batteries of 24V in turn, gives the 12V electric; Such mode is compared with the high frequency switch power that 24V changes 12V; Its efficient is high, no electromagnetic interference, and circuit is simple; Cost is low, also can guarantee the harmony of 2 12V cell capacity simultaneously.
Description of drawings
Shown in Figure 1 for the voltage change-over switch control circuit structural representation of preferred embodiment of the present invention.
Embodiment
In order more to understand technology contents of the present invention, special act specific embodiment also cooperates appended graphic explanation following.
The present invention proposes a kind of voltage change-over switch control circuit, uses the low frequency on-off mode to use 2 12V batteries of 24V in turn, gives the 12V electric.
Please refer to Fig. 1, the present invention proposes a kind of voltage change-over switch control circuit, comprising:
Square-wave generator Cont; It has two voltage input ends; Import first voltage and second voltage respectively, said square-wave generator Cont comprises the first output Q and second output
anti-phase output square wave respectively;
Wherein the first output Q is connected with the first control circuit of being made up of first resistance R 1, second resistance R 2, the first capacitor E1, the 3rd diode D3, the first triode M1 and the first diode D1; Said second output
is connected with the second control circuit of being made up of the second triode M2, earth resistance RI and the second diode D2; Be parallel with the second capacitor E2 and load resistance RL between said first control circuit and the second control circuit; Said square-wave generator Cont has feedback end, receives from the feedback current IS of second triode M2 feedback.
Further, said first voltage is 12V, and said second voltage is 24V, and the voltage that promptly battery 24V end and middle-end 12V pick out among Fig. 1, battery adopt 2 12V batteries to be in series.Said square-wave generator is the square-wave generator of 50% duty ratio; Square wave frequency is adjustable, and the said first output Q and second output
anti-phase are respectively exported the square wave of 50% duty ratio.
When input voltage 12V or 24V cross low or too high.And feedback current IS is when excessive, and the first output Q and second output
are closed (being low level).Just often; As second output
, the first output Q=0; The then second triode M2 conducting; The first triode M1 closes, and the first capacitor E1 went up and was filled with 12V voltage through the 3rd diode D3 this moment.The time constant of the first capacitor E1 and second resistance R 2 is bigger more than 5 times than square-wave cycle.At this moment 12V (voltage of bottom storage battery) is added on the load resistance RL through the second triode M2 of the first diode D1 and conducting; Second cycle, then the second triode M2 ended when second output
, the first output Q=1.The first triode M1 conducting (the first triode M1 is by the driven conducting on the first capacitor E1).The voltage of upper cell is added on the load resistance RL through the first triode M1 and the second diode D2 of conducting, has so just realized that the 12V load uses the 12V battery of 2 series connection in turn.
The output of the said first output Q and second output
rising edge of one of them on sequential should omit slow than another trailing edge, not have the spike greater than 12V in the proof load.The first diode D1 and the second diode D2 should use the less Schottky diode of forward voltage drop, to reduce loss.
In sum, the present invention has designed an electronic switching circuit, uses the low frequency on-off mode to use 2 12V batteries of 24V in turn; Give the 12V electric, such mode is compared with the high frequency switch power that 24V changes 12V, and its efficient is high; No electromagnetic interference; Circuit is simple, and cost is low, also can guarantee the harmony of 2 12V cell capacity simultaneously.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under the present invention, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (4)
1. a voltage change-over switch control circuit is characterized in that, comprising:
Square-wave generator, it has two voltage input ends, imports first voltage and second voltage respectively, and said square-wave generator comprises first output and second output, respectively anti-phase output square wave;
Wherein first output is connected with the first control circuit of being made up of first resistance, second resistance, first capacitor, the 3rd diode, first triode and first diode; Said second output is connected with the second control circuit of being made up of second triode, earth resistance and second diode; Be parallel with second capacitor and load resistance between said first control circuit and the second control circuit; The two ends of said second capacitor are connected with the source electrode of first triode and the drain electrode of second triode respectively, and the two ends of said load resistance are connected with the cathode terminal of first diode and the anode tap of second diode respectively;
Wherein, Said first output is connected with said second voltage through first resistance; The common point of said first output and said first resistance is connected with first triode through first capacitor-coupled; Said first capacitor is connected with the grid level of first triode, and the drain electrode of said first triode is connected with said second voltage, and the anode tap of said first diode is connected with said first voltage; The cathode terminal of said first diode is connected with the source electrode of first triode; The two ends of said second resistance are connected with the grid of first triode and the source electrode of first triode respectively, and the cathode terminal of said the 3rd diode is connected with the grid of said first triode, and the anode tap of said the 3rd diode is connected with the source electrode of said first triode;
Said second output is connected with the grid of second triode, and the anode tap of said second diode is connected with the drain electrode of second triode, and the cathode terminal of second diode is connected with said first voltage, and the source electrode of said second triode passes through ground resistance earth;
Said square-wave generator Cont has feedback end, receives from the feedback current of second triode feedback;
Wherein, said first voltage is 12V, and said second voltage is 24V.
2. voltage change-over switch control circuit according to claim 1 is characterized in that, said square-wave generator is the square-wave generator of 50% duty ratio, said first output and second output, and the square wave of 50% duty ratio is exported in anti-phase respectively.
3. voltage change-over switch control circuit according to claim 1 is characterized in that, said first diode and second diode are Schottky diode.
4. voltage change-over switch control circuit according to claim 1 is characterized in that, the output of said first output and second output rising edge of one of them on sequential is slower than another trailing edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101696854A CN101854076B (en) | 2010-05-07 | 2010-05-07 | Voltage change-over switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101696854A CN101854076B (en) | 2010-05-07 | 2010-05-07 | Voltage change-over switch control circuit |
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| CN101854076A CN101854076A (en) | 2010-10-06 |
| CN101854076B true CN101854076B (en) | 2012-11-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2202995Y (en) * | 1994-08-08 | 1995-07-05 | 王大文 | 24V/12V supply automatic converting switch for vehicles |
| FR2802723A1 (en) * | 1999-12-21 | 2001-06-22 | Systemes Et Conversion Ind D E | System for providing direct current at various voltages from batteries in series, comprises a continuos/continuous convertor which is connected such as to equalize battery currents during charge and discharge |
| CN2454973Y (en) * | 2000-11-17 | 2001-10-17 | 刘伟 | Time-sharing switch-over device for cells |
| JP2010093979A (en) * | 2008-10-09 | 2010-04-22 | Daimler Ag | Power supply for vehicle |
| CN201813174U (en) * | 2010-05-07 | 2011-04-27 | 纽福克斯光电科技（上海）有限公司 | Voltage transfer switch control device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10196772A (en) * | 1996-12-29 | 1998-07-31 | Jatco Corp | Automobile and automatic transmission control device |
-
2010
- 2010-05-07 CN CN2010101696854A patent/CN101854076B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2202995Y (en) * | 1994-08-08 | 1995-07-05 | 王大文 | 24V/12V supply automatic converting switch for vehicles |
| FR2802723A1 (en) * | 1999-12-21 | 2001-06-22 | Systemes Et Conversion Ind D E | System for providing direct current at various voltages from batteries in series, comprises a continuos/continuous convertor which is connected such as to equalize battery currents during charge and discharge |
| CN2454973Y (en) * | 2000-11-17 | 2001-10-17 | 刘伟 | Time-sharing switch-over device for cells |
| JP2010093979A (en) * | 2008-10-09 | 2010-04-22 | Daimler Ag | Power supply for vehicle |
| CN201813174U (en) * | 2010-05-07 | 2011-04-27 | 纽福克斯光电科技（上海）有限公司 | Voltage transfer switch control device |
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| Publication number | Publication date |
|---|---|
| CN101854076A (en) | 2010-10-06 |
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